National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Mostly Cloudy

45°F

7°C

Humidity 48%
Wind Speed NW 8 mph
Barometer 29.73 in
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill41°F (5°C)
Last update 11 Jan 3:56 pm EST
Extended Forecast for

Central Islip NY

  • This Afternoon

    This Afternoon: A 30 percent chance of showers. Partly sunny, with a steady temperature around 42. West wind around 11 mph.

    High: 42 °F

    Chance
    Showers

  • Tonight

    Tonight: A 30 percent chance of showers before 7pm. Partly cloudy, with a low around 28. Wind chill values between 20 and 25. West wind 13 to 15 mph, with gusts as high as 33 mph.

    Low: 28 °F

    Chance
    Showers then
    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 41. Wind chill values between 20 and 30. Southwest wind around 11 mph, with gusts as high as 25 mph.

    High: 41 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 30. West wind around 7 mph.

    Low: 30 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 44. West wind 5 to 9 mph.

    High: 44 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a steady temperature around 39.

    Low: 39 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 47.

    High: 47 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A 40 percent chance of rain after 1am. Cloudy, with a low around 34.

    Low: 34 °F

    Cloudy then
    Chance Rain

  • Thursday

    Thursday: A 40 percent chance of rain. Mostly cloudy, with a high near 42.

    High: 42 °F

    Chance Rain

Detailed Forecast

This Afternoon
A 30 percent chance of showers. Partly sunny, with a steady temperature around 42. West wind around 11 mph.
Tonight
A 30 percent chance of showers before 7pm. Partly cloudy, with a low around 28. Wind chill values between 20 and 25. West wind 13 to 15 mph, with gusts as high as 33 mph.
Monday
Mostly sunny, with a high near 41. Wind chill values between 20 and 30. Southwest wind around 11 mph, with gusts as high as 25 mph.
Monday Night
Partly cloudy, with a low around 30. West wind around 7 mph.
Tuesday
Sunny, with a high near 44. West wind 5 to 9 mph.
Tuesday Night
Mostly cloudy, with a steady temperature around 39.
Wednesday
Mostly cloudy, with a high near 47.
Wednesday Night
A 40 percent chance of rain after 1am. Cloudy, with a low around 34.
Thursday
A 40 percent chance of rain. Mostly cloudy, with a high near 42.
Thursday Night
A chance of rain and snow before 1am, then a chance of snow. Mostly cloudy, with a low around 22. Chance of precipitation is 40%.
Friday
Mostly sunny, with a high near 34.
Friday Night
Partly cloudy, with a low around 24.
Saturday
Mostly sunny, with a high near 38.
Saturday Night
Mostly cloudy, with a low around 26.
Sunday
A chance of rain and snow. Partly sunny, with a high near 37.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Central Islip NY
 40.79°N 73.2°W (Elev. 98 ft)
Last Update:
1:42 pm EST Jan 11, 2026
Forecast Valid:
4pm EST Jan 11, 2026-6pm EST Jan 18, 2026
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation